The separate infrastructure for the last bit into Oxford so Chiltern services won't get delayed by disruption on the Oxford - Banbury line.
That piece is delayed & will form part of the Oxford re-signalling project & electrification.
--- old post above --- --- new post below ---
]It will be interesting to see how having two stations with direct connections to Marylebone will affect Bicester commuters too. I presume a lot of them will use Water Eton Parkway if they live out that way anyway (I doubt everybody who uses Bicester North to commute is from Bicester) but how the locals will react to having a split service is anybodies guess. I presume most of the trains to/from Town station will be express trains while North will retain the semi fasts and the trains to Banbury/Stratford/Birmingham, but what do you do if you are at Marylebone with your car parked at North but the next train is to Town? There is so much parking at Bicester North these days that a lot of people will still use it, but do you think that rail users will be welcome in the Village car park for Bicester Town?
Firstly, the stations will be grouped in the fares manual so the fare will be same from either station to make inter-station travel possible & legal. Currently one fare is higher than the other, and rises at one to bring it up to the other are taking place.
The 'village' car park will use part of the Bicester Village car park Mon-Fri, so capacity at either won't be a problem. Pax will have to choose which suits them best & walk twixt the two if they choose to return to the wrong one! It is as has been said, a 15minute walk....
However, I can't see Bicester having sufficient travelling public to fully use a 4 train/hour service, certainly off-peak. I suspect that Bicester North will reduce to 1 tph off-peak - probably the semi-fast Birmingham.
The Bicester North stoppers are the ones being diverted to Oxford, making one of the 2 tph services. I think the other is the Princes Risborough terminator which will be extended to Oxford. I know Chiltern have said that the trains required are already using the paths in MYB and won't be a need for further paths. Of course, both trains stopping patterns will change.
Bear in mind there is a max 66min trip allowed for these services, so the stops will have to be minimal. I think HWY will get 2tph, while PRR and HDM get one each. Along with stops south of Bicester, that'll be all the stops.